U.S. General Douglas MacArthur and his controversial proposal during the Korean War to drop 30 to 50 atomic bombs on Chinese supply lines and airbases in Manchuria, while creating a radioactive "cobalt belt" to block Chinese troops.
Fearing a wider conflict with the Soviet Union, President Harry S. Truman rejected this escalation and removed MacArthur for insubordination in April 1951.
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